freud 2.12.0 Released

[Tommy Waltmann]

Version 2.12.0 of freud is now released. Thank you to all who contributed code and reported issues. Please report issues and suggest feature enhancements via the freud GitHub issue tracker.

• conda-forge package: https://anaconda.org/conda-forge/freud
• PyPI package: https://pypi.org/project/freud-analysis/
• GitHub repository: https://github.com/glotzerlab/freud
  
• Documentation: https://freud.readthedocs.io/en/stable/
• Source tarball: https://glotzerlab.engin.umich.edu/Downloads/freud/

This release adds the following features and changes:

### Added
* Mass dependence in `freud.cluster.ClusterProperties`.
* Inertia tensor calculation in `freud.cluster.ClusterProperties`.

### Fixed
* Compatibility with new namespace for `MDAnalysis.coordinates.timestep.Timestep`.